mapsearch extension needs redesign

[smrgeoinfo]

from FuhuXia commented on Mar 3 2015 on issue #4

"This issue is related to the mapsearch extension design and volume of datasets. It turns out a postgres db query is used to process the bbox spatial info, then all qualified dataset ids are collected from db and passed to solr query. When the id collection gets large, solr cant handles the large query and returns error. So when total datasets is in hundreds, or the bbox is small, the search works fine. When bbox is large and/or total datasets grow to thousands, the issue will surface. To fix the issue, we need to change the way mapsearch extension do spatial search, it needs to pass bbox info to the solr and let solr process spatial info, not postgres db."